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Human immunodeficiency virus HIV is the virus that causes acquired immunodeficiency syndrome AIDS HIV can enter the bloodstream through contact with an infected persons body fluids such as blood or semen This can happen during sex or by sharing needles used to inject drugs An infected woman who is...

What is human papillomavirus HPV Human papillomavirus HPV is a virus that can be passed from person to person through skintoskin contact More than 100 types of HPV have been found About 30 of these types infect the genital areas of men and women and are spread from person to person through sexual ...